Socket and plug connection for electric circuits



July 27,; 192 1,593,985

A. NIELSEN SOCKET AND PLUG CONNECTION FOR ELECTRIC CIRCUITS Filed March24 1923 rn' niedigluly. 1

- PATENTJ'OFF 1; were sonmcnsnn a oo., or cnnrsrmnm; nonwa'v. socxnr am:rnuecomcrron 0a 'nmcrnrc cmcu'rrs Application fled larch 24, 192;, term:0. 027,235, and m myremws, 192a.

The present invention. relatesto the type of electric plug and socketconnections which comprises. a central lug, having two radial .contactpins, and w ich-fits into a central recess in the socket, the radialcontact arms of the plug'being brought in engagement with contactsurfaces in the socket upon being rotated a certain angle after itsintroduction in the socket. The invention has for its object to providea plug and 'socketconnection of this type, having means for momentaneousclosing and interruption of the 'current, sa1d means acting also toprevent unintentional touching of t e contact surface 1ns1de the socket.v

On the drawing: a Fig. 1 is an axial sectional'viewthrough the socketembodying the present invention. Fig. 2 is a lan view of the same withthe plug remove Fig. 3 is a detail view of the'mechamsm forinstantaneous closing and interruption seen from below and Fig. 4 is adetail axial section through the mechanism of Fig. 3. I I

A is the plug, which has a cylindricalextension, carrying two radialcontact arms a, b of copper, brass, aluminium or the like connected withthe current leads. The plug with its radial arms a, b, is adapted to beintroduced in the socket through a corresponding opening in the socketcover.

I Inside the socket there is provided two contact members d, 6, withwhich the contact arms a, b may be brought in engagement by-turnin'g theplug about its axis at a right angle. The contact members (.1, e areconnected. with the main lines. The above mentioned construction of plugand socket connection is a well known type and does not form any part ofthe present invention.

The socket is provided with an intermedi-- ant I partition f, having acentral opening and at the underside of its intermediant partition thereis mounted in accordance with 3 and v4 comprises-a central rotatablememher 2, having on its circumference two camsor bosseso, n, which areadapted to be .en- I gaged by correspondingcams or bosses l, m, 5

'vided according to the present invention 0 with a central rod 1'angular or flat in cross section and extending upwardly towards theopening inthe socket cover and adapted to fit into a correspondinglyshaped opening 8 in the plug, thus connecting the plug with B5 I therotatable member 12, when the plug is. introduced in the socket. Forbringing the plug contact arms a, b-into'or out of engagementwithnontact members 11, e, the bosses n, :0 on rotatable member p willhave to be. brought past the bosses l, m on arms g, h, which causes asnapping movement to.

take place at the point where the contact arms a, b, are brought into orout of contact with contact (1,0. a

Besides servingthis purpose. the central rod or pin r obstructs theopening in the, socket leading to .the interior thereof, and thusprevents unintentional touching of the contact members (1, e inside thesocket.

Claims:- I II I I I 1. In a plug and socket connection for electriccircuits,'a plug having radial contact arms, a socket having contactsurfaces into and out of engagement with which said contact arms areadapted to be moved by turning the plug about its axis after its in-'troduction into the socket, means located. I within the socket forcausing instantaneous I engagement and disengagement between the plugcontact arms and the socket contact. surfaces, andmeans including acoupling rod in the socket for establishing an operative connectionbetween the plug. and said means when the plug is inserted in thesocket. 2. In a plug and socket connection for electric circuits, a plughaving radial contact arms, a socket having contact surfaces into andout of enga ement with which said contact armsare a apted to be moved byturning the plug about its axis after its innrnnn'mnsnn, or cnms'rrmu,nonwair', Assrenon ro nnnxgnrcrrnrsrrnmaar" I i i .troduction into thesocket, niehns compristhe plng, the plu havin a recess adapted her forcausing instantaneous engagement in the socket.

ing a rotatable spring controlled cam rnemto receive said r when't eplug is inserted and disengagement between the'plug contact In testimonythat I claim the foregoing as arms and the socket contact surfaces, anda my invention, I have signed my name,

coupling rodassociated with said rotatable member extending in the axialdirection of ALFRED NIELSEN.

